encryptdlg.cpp

基于rsa算法实现的用两个质数进行数据加密的算法

/*****************************************************************************
FileName  :  EncryptDlg.cpp
  Author  :  GongHuiBin([e-mail])
    Date  :  13/June/2003
******************************************************************************/
// EncryptDlg.cpp : implementation file
//

#include "stdafx.h"
#include "math.h"
#include "Encrypt.h"
#include "EncryptDlg.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

#define ENCRYPT_KEY 95

#define ENCRYPT_P 13
#define ENCRYPT_Q 15 
//设置用于明键加密的两个质数

/////////////////////////////////////////////////////////////////////////////
// CAboutDlg dialog used for App About

class CAboutDlg : public CDialog
{
public:
	CAboutDlg();

// Dialog Data
	//{{AFX_DATA(CAboutDlg)
	enum { IDD = IDD_ABOUTBOX };
	//}}AFX_DATA

	// ClassWizard generated virtual function overrides
	//{{AFX_VIRTUAL(CAboutDlg)
	protected:
	virtual void DoDataExchange(CDataExchange* pDX);    // DDX/DDV support
	//}}AFX_VIRTUAL

// Implementation
protected:
	//{{AFX_MSG(CAboutDlg)
	//}}AFX_MSG
	DECLARE_MESSAGE_MAP()
};

CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD)
{
	//{{AFX_DATA_INIT(CAboutDlg)
	//}}AFX_DATA_INIT
}

void CAboutDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CAboutDlg)
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CAboutDlg, CDialog)
	//{{AFX_MSG_MAP(CAboutDlg)
		// No message handlers
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CEncryptDlg dialog

CEncryptDlg::CEncryptDlg(CWnd* pParent /*=NULL*/)
	: CDialog(CEncryptDlg::IDD, pParent)
{
	//{{AFX_DATA_INIT(CEncryptDlg)
	m_Target = _T("");
	m_Source = _T("");
	m_Key = _T("");
	m_Decode = _T("");
	//}}AFX_DATA_INIT
	// Note that LoadIcon does not require a subsequent DestroyIcon in Win32
	m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}

void CEncryptDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CEncryptDlg)
	DDX_Text(pDX, IDC_EDIT_TARGET, m_Target);
	DDX_Text(pDX, IDC_EDIT_SOURCE, m_Source);
	DDX_Text(pDX, IDC_EDIT_KEY, m_Key);
	DDX_Text(pDX, IDC_EDIT_DECODE, m_Decode);
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CEncryptDlg, CDialog)
	//{{AFX_MSG_MAP(CEncryptDlg)
	ON_WM_SYSCOMMAND()
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	ON_BN_CLICKED(IDC_BTN_ENCRYPT1, OnBtnEncrypt1)
	ON_BN_CLICKED(IDC_BTN_ENCRYPT2, OnBtnEncrypt2)
	ON_BN_CLICKED(IDC_BTN_ENCRYPT3, OnBtnEncrypt3)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CEncryptDlg message handlers

BOOL CEncryptDlg::OnInitDialog()
{
	CDialog::OnInitDialog();

	// Add "About..." menu item to system menu.

	// IDM_ABOUTBOX must be in the system command range.
	ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX);
	ASSERT(IDM_ABOUTBOX < 0xF000);

	CMenu* pSysMenu = GetSystemMenu(FALSE);
	if (pSysMenu != NULL)
	{
		CString strAboutMenu;
		strAboutMenu.LoadString(IDS_ABOUTBOX);
		if (!strAboutMenu.IsEmpty())
		{
			pSysMenu->AppendMenu(MF_SEPARATOR);
			pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu);
		}
	}

	// Set the icon for this dialog.  The framework does this automatically
	//  when the application's main window is not a dialog
	SetIcon(m_hIcon, TRUE);			// Set big icon
	SetIcon(m_hIcon, FALSE);		// Set small icon
	
	// TODO: Add extra initialization here
	
	return TRUE;  // return TRUE  unless you set the focus to a control
}

void CEncryptDlg::OnSysCommand(UINT nID, LPARAM lParam)
{
	if ((nID & 0xFFF0) == IDM_ABOUTBOX)
	{
		CAboutDlg dlgAbout;
		dlgAbout.DoModal();
	}
	else
	{
		CDialog::OnSysCommand(nID, lParam);
	}
}

// If you add a minimize button to your dialog, you will need the code below
//  to draw the icon.  For MFC applications using the document/view model,
//  this is automatically done for you by the framework.

void CEncryptDlg::OnPaint() 
{
	if (IsIconic())
	{
		CPaintDC dc(this); // device context for painting

		SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0);

		// Center icon in client rectangle
		int cxIcon = GetSystemMetrics(SM_CXICON);
		int cyIcon = GetSystemMetrics(SM_CYICON);
		CRect rect;
		GetClientRect(&rect);
		int x = (rect.Width() - cxIcon + 1) / 2;
		int y = (rect.Height() - cyIcon + 1) / 2;

		// Draw the icon
		dc.DrawIcon(x, y, m_hIcon);
	}
	else
	{
		CDialog::OnPaint();
	}
}

// The system calls this to obtain the cursor to display while the user drags
//  the minimized window.
HCURSOR CEncryptDlg::OnQueryDragIcon()
{
	return (HCURSOR) m_hIcon;
}

void CEncryptDlg::OnBtnEncrypt1() 
{
	// TODO: Add your control notification handler code here
	UpdateData(true);
	if (m_Source.GetLength()<=0) 
	{
		AfxMessageBox("对不起，加密源文不能为空!");
		return;
	}
	if (m_Key.GetLength()<=0)
	{
		AfxMessageBox("对不起，加密键不能为空!");
		return;
	}
	m_Target=Encrypt_Key(m_Source,m_Key);
	//m_Title="算法：密键加密";
	SetWindowText("算法：密键加密");
	UpdateData(false);
	
}

/*******************************************************************
函数名称：Encrypt_Key
函数说明：明键加密算法
参数说明：
　　Source : 加密源文
       Key : 加密键
返回结果：加密处理后的密文
********************************************************************/
CString CEncryptDlg::Encrypt_Key(CString Source,CString Key)
{
	int iSourceLen,iKeyLen;
	int iCount;
	div_t div_Result;
	char strTarget[255];
	char pKey[255],pSource[255],pMid[255];
	CString strTmp;
	int i,j,n;
	BYTE PWD_key[255];

	j=0;
	for (i=32;i<=126;i++)
	{
		PWD_key[i]=j;
		j++;
	}//取ASCII值在32~126之间的可视字符

	iSourceLen=Source.GetLength();
	iKeyLen=Key.GetLength();
	div_Result=div(iSourceLen,iKeyLen);
	if (div_Result.rem)
		iCount=div_Result.quot+1;
	else
		iCount=div_Result.quot;
	wsprintf(pKey,"%s",m_Key);

	n=0;
	for (i=1;i<=iCount;i++)
	{
		strTmp=Source.Mid((i-1)*iKeyLen,iKeyLen);
		if (strTmp.GetLength()<iKeyLen)
		{
			for (j=1;j<=iKeyLen-strTmp.GetLength();j++)
				strTmp+=" ";
		}
		wsprintf(pSource,"%s",strTmp);

		for (j=1;j<=iKeyLen;j++)
		{
			int k1;
			int k2;
			k1=PWD_key[pKey[j-1]];
			k2=PWD_key[pSource[j-1]];
			int k=k1+k2;
			div_Result=div(k,ENCRYPT_KEY);
			k=div_Result.rem;
			pMid[j-1]=k;
			strTarget[n++]=k;
		}//对源文进行替换加密处理

	}
	for (j=0;j<n;j++) 
	{
		strTarget[j]+=32;
		if (strTarget[j]==32) strTarget[j]='*';  //用“*”替代密文中的空格
	}
	strTarget[n]='\0';

	CString strResult;
	strResult.Format("%s",strTarget);
	return(strResult);
}

DWORD Exp(int k,int e,int r)
{
	DWORD dwResult;
	div_t div_Result;
	dwResult=k;
	div_Result=div(dwResult,r);
	dwResult=div_Result.rem;
	for (int i=1;i<e;i++) 
	{
		dwResult*=k;
		div_Result=div(dwResult,r);
		dwResult=div_Result.rem;
	}
	return(dwResult);
}

void CEncryptDlg::OnBtnEncrypt2() 
{
	// TODO: Add your control notification handler code here
	UpdateData(true);
	if (m_Source.GetLength()<=0) 
	{
		AfxMessageBox("对不起，加密源文不能为空!");
		return;
	}

	m_Target=Encrypt_KnownKey(m_Source);
	SetWindowText("算法：明键加密");

	UpdateData(false);
}


CString CEncryptDlg::Encrypt_KnownKey(CString Source)
{
	int r=ENCRYPT_P*ENCRYPT_Q;
	int e=101;  
	//设置加密键，一般比P与Q大的质数就可以选作加密键
	int k=(ENCRYPT_P-1)*(ENCRYPT_Q-1);
	int d=5;
	//求得解密键，即满足公式：(d*11) mod k=1

	char pSource[255];
	char pTarget[255];
	int iLen;
	int i;
	DWORD dw1;

	wsprintf(pSource,"%s",m_Source);
	iLen=m_Source.GetLength();
	for (i=0;i<iLen;i++)
	{
		div_t div_Result;
		dw1=Exp(pSource[i],e,r);
		div_Result=div(dw1,r);
		pTarget[i]=div_Result.rem;
		//获取密文
	}
	pTarget[iLen]='\0';

	CString strTarget;
	strTarget.Format("%s",pTarget);
	return(strTarget);

}

CString CEncryptDlg::Decode_KnownKey(CString Source)
{
	int r=ENCRYPT_P*ENCRYPT_Q;
	int e=101;  
	//设置加密键，一般比P与Q大的质数就可以选作加密键
	int k=(ENCRYPT_P-1)*(ENCRYPT_Q-1);//k=168
	int d=5;
	//求得解密键，即满足公式：(d*29) mod k=1

	int iLen=m_Source.GetLength();
	char pSource[255],pTarget[255];
	wsprintf(pSource,"%s",m_Source);
	for (int i=0;i<iLen;i++) 
	{
		DWORD dw1;
		dw1=Exp(pSource[i],d,r);
		div_t div_Result;
		div_Result=div(dw1,r);
		pTarget[i]=div_Result.rem;
	}
	pTarget[iLen]='\0';

	CString strTarget;
	strTarget.Format("%s",pTarget);
	return(strTarget);
}

void CEncryptDlg::OnBtnEncrypt3() 
{
	// TODO: Add your control notification handler code here
	UpdateData(true);
	if (m_Source.GetLength()<=0) 
	{
		AfxMessageBox("对不起，解密源文不能为空!");
		return;
	}
	m_Decode=Decode_KnownKey(m_Source);
	SetWindowText("算法：明键解密");
	UpdateData(false);
}